The behavior of the electromagnetic (EM) launcher depends on the structure of the
construction. The dynamics of the EM construction and the local effects of the EM forces are
topical issue in exploring and designing EM launcher device. This paper is aimed to refine
mechanical behavior of the open barrel design EM launcher structure due to EM force evaluated
by EM analysis based on three different shapes of armatures. The 3D finite element EM model
was generated and the J×B force density distribution in the rail volume was calculated. The results
of EM model calculations were applied further as input for structural mechanics model. The results
of the finite element EM and mechanical analysis of the armatures influence are presented